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TIL Neanderthals built underground buildings out of stalagmites 175,000 years ago.

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6EObX TIL that the Soviets realised that the Americans and British were developing an atomic bomb when they noticed that Western scientists had ceased publishing papers on nuclear science. Correctly guessing that nuclear science had been made a state secret, they began their own program
Bgr6r TIL that bees die a very gruesome death when they sting you. "As the honeybee tries to pull out the stinger, it ruptures its lower abdomen, leaving the stinger embedded, pulling out instead a string of digestive material, muscles, glands and a venom sac."
awkKo TIL that blond hair in humans developed only 11,000 years ago as an evolutionary response to the lack of sunlight in Northern Europe to enable more Vitamin D synthesis.
ADJVB TIL that, many years after chewing gum had been around, in 1906, the first BUBBLE gum ever sold was called Bilbber-Blubber
L7w9 TIL there is a logical fallacy called the fallacy fallacy, the fallacy of overusing fallacy in the analysis of arguments